Improvement in reversing-valves for steam-engines



S. H. 'IBEVIN-S & J. WEIS. BEVERSIN'G VALVES FOR STEAM-ENGINES. No. 171,715. 7 Patented J'an.4,1876

d 5 L m 4 MPETERS, FHDTO-LITHOGRAPHER, WASHINGTON. D C.

SETH- 11. BEvINs, on NEW voBK, N. Y., Ann JOSEPH wins, or JERSEY F CITY, NEW JE S Y.

IMPROVEMENT IN R'EV'ERSlNG-VA'LVES FOR STEAM-ENGINES.

Specification forming part of Letters Patent No. 171,715, dated January 4, 1876; application n'led November 15, 1875.

To all whom it may concern:

Be it known that we, SETH H. BEVINS, of the city and State of New York, and JOSEPH WEIS, of Jersey City, in the State of New Jersey, have invented an Improvement in Reversible Steam-Engines, of which the following is a specification:

1n the steam-chest there is an ordinary slide-valve, and its ports lead to intermedi: ate chambers, in which are secondary slidevalves that can be moved for stopping or reversing the engine. Between these secondary valves and the steam-cylinder thereare two sets of ports. One set pass directly to the engine-cylinder, the other set lead to the opposite ends of the cylinder, and the ports in the secondary valves are arranged in such a manner that when they are in one position the direct ports are open, and the engine is revolved in one direction, and when the secondary valves are moved the steam is shut 011' to stop the engine, and the further movement opens the other set of ports that pass to the opposite ends of the cylinder, so that the revolution of the engine will be in the op posite direction to that'before named.

This engine is especially adapted to elevators in buildings, wherein the stopping, starting, and reverse movements are frequent, and under the control of the person in the car; and the present invention is an improvement upon that for which Letters Pat'- ent No. 155,217 were granted to us.

In the drawing, Figure l is a longitudinal section of the cylinder and valve-chest. Fig. 2 is a cross-section of the same .jat the line as 00. Fig. 3 is the secondary valve-seat at the line y y, and Fig. 4 shows the secondary valves.

The engine-cylinders usually stand vertically, and are double, and act upon right-angled cranks. We have only shown one of the cylinders and its valves, the other being a counterpart.

The cylinder a, piston 12, piston-rod c, steamchest d, and slide-valve e are of ordinary construction, except that there is space for our improved parts between the seat of the slide-valve and the cylinder. The ports f and 9 open into the chambers of the secondary valves h and k. The steam-ports between-the chambers containing the secondary valves h and k and the cylinder a are double.' One set, Zm, pass almost directly into the cylinder at the respective ends, but they are not in line with each other; but the short port 1 is in line with the long port n, that reaches to the other end of the cylinder, and the other short portmis in line with the other long port 0, reaching to the, opposite end of the cylinder.

The valves h k are made peculiarly. There are two ports passing from the face diagonally, or in a curved line to the back, so that at the back the ports are nearly in line, but at the face they are sufliciently far apart to be in line transversely with the respective ports 1 n or m 0. The valves h k are provided with valverods, connected to the rockshaft 8' by arms at opposite sides, and the ports of the valves h and k are constructed so that when the secondary valve h is moved 'one way, and the other valve, is, the other way,the ports 2 3 of said valves may coincide with and open the ports 1 and m, to cause the engine to revolve in the ordinary way, and when the valves h and k are moved to the other position the ports 4 5 open the ports n and 0, and cover the other ports 5 and m, and the engine revolves the other way.

The intermediate position of the secondary valves is one of rest, in which the central portions of the valves cover all the ports I and m, and n and 0.

It is to be understood that when this engine is used with an elevator the rock-shaft s is moved by a drum, to which the elevatorrope is connected.

The ports 6, n, 0, and m are shown as in line with each other, and in a plane passing through the center of the steam-cylinder, and the ports pass diagonally in, reaching the passage-ways that lead to the respective ends of the cylinder; but if the ports are not in line, as shown, but placed over and in line with the respective long ports reaching from one UnrrEn STATES? Pn'rnlvrprrron.

end of thecylinder to thelother, then the valveswill have to be positioned in relation to their valve'rods, rocking lever, and. shaft 8, so as to accommodate such position of the ports I n 0 m.

We cla m as our invention- The secondary valves h k, constructed sub- I stantially as specified, and sliding transverse- 13' of the engine-cylinder in chambers between the main valve and the engine, in combina tion with the-short portsland m,andlong ports n and ,o,substantially as set forth.

Signed by us this 3d day of November, A.

SETH H. YBEVINS. JOSEPH WEIS.

Witnesses GEO. T. PINGKNE'Y, CHAS. H. SMITH. 

